Green Tourmaline - Calibrated and Single Stones

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Green Tourmaline
Chemical Formula	Ca(Li,Al)3Al6B3Si6O27(OH)3(OH,F)	Green Tourmaline comes from the Silicate family. Green Tourmaline are natural and are not subject not treatment. Major sources of Green Tourmalines are Africa, Brazil, USA and Afghanistan. We carry Green Tourmaline in calibrated sizes in several shapes such as rounds, ovals, marquise, cushions, etc in various sizes. For more information on the sizes we usually keep in calibrated sizes, please click here. We can also cut precision cut Green Tourmalines, this is finely cut and crafted to bring the maximum brilliancy into it. This is done with the help of automated machines and skilled labour. For your demands in precision cut, please contact us for more information. We can accomodate pairs, layouts and single unique Green Tourmalines. Also perfected is the art of special cuts or custom cuts. This is suited to fit your specifications and can be any shape and/or cut of your choice. For your requirements, please contact us.
Crystal Habit	Parallel and elongated
Crystal System	Trigonal
Cleavage	Indistinct
Fracture	Uneven, small conchoidal, brittle
Hardness (Mohs Scale)	7-7.5
Luster	Vitreous
Refractive Index	nω=1.635–1.675 nε=1.610–1.650
Optical properties	Double refractive, Uniaxial (-)
Birefringence	-0.018 to -0.040
Pleochroism	Typically moderate to strong
Streak	White
Specific Gravity	3.06
Dispersion	0.017

Green Tourmaline - Calibrated Sizes

We make the following calibrated sizes and can even make other in-between sizes as well. For rounds, we can cut step cut and brilliant cut (diamond cut). For squares, we can cut step cut and princess cut and and special cuts such as french cut as well.

Oval / Cushion	3x2	4x3	5x3	5x4	6x4	6x5	7x5	8x6	9x7	10x8	& bigger
Pear	3x2	4x3	5x3	5x4	6x4	6x5	7x5	8x6	9x7	10x8	& bigger
Round		1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0	5.5	& bigger
Square / Cushion		1.5	2.0	2.5	3.0	3.5	4.0	4.5	5.0	5.5	& bigger
Marquise	3x1.5	4x2	5x2.5	6x3	7x3.5	8x4	9x4.5	10x5	12x6	14x7	& bigger
Baguette	3x1.5	4x2	5x2.5	6x3	7x3.5	8x4	9x4.5	10x5	12x6	14x7	& bigger
Octagon		4x3	5x3	5x4	6x4	6x5	7x5	8x6	9x7	10x8	& bigger
Heart					3.0	3.5	4.0	4.5	5.0	5.5	& bigger
Trillion					3.0	3.5	4.0	4.5	5.0	5.5	& bigger
Drop / Briollet		4x3	5x3	5x4	6x4	6x5	7x5	8x6	9x7	10x8	& bigger